Hey guys it has been awhile since I poked your brain cases. I am getting myself to wrapped up looking a nuances so I figured one of you might have the answer.
Is the table listed on AS:CE pg. 151 only for off-board attacks? The reason I ask is because in the rear of the manual, AS:CE pg. 209, it has it listed as just Artillery Attack Modifiers (Not Off-board). The spotter modifiers change in that table using optional rule artillery: Does the spotter benefits only apply to off-board attacks. Meaning on-board artillery do not gain benefits from RCN/BH and Successive POI unless the target is further than 42" and it becomes off-board. as those are only listed in the off-board artillery table, even though you are using optional rules.
(Standard Rules pg. say onboard use only L/PRB within 24")
EDIT: The TLDR, if using Optional Artillery Rules and a mech is 41" away, does my spotter with RCN provides no bonus? But if they are at 43" away they suddenly can add a -1 cause its now considered off-board?